Make sure you don't see any light between the bottom of the die and the shell holder when you close the die on a case. If there is light, the shoulder is not being pushed back enough and the side wall maybe not back in enough. If so, dial the die down until you have contact with the shell holder, then lift the arm, dial the die down another 1/8 - 1/4 turn, at least until you can't see light between the die and shell holder when you close the die down on a case. You may close the die down on the shell holder without a case but insert a case, the press may have some flex when compressing on a case. I've seen that happen before.
If this doesn't fix the problem, go with an RCBS die. I've used one before in a Tikka 300WSM with no issues.
Are you sure it isn't a Lee collet sizing die? If you're using that, the case is sized to another chamber dimension and you could have problems trying to make it fit. I've experienced that too.
If this doesn't fix the problem, go with an RCBS die. I've used one before in a Tikka 300WSM with no issues.
Are you sure it isn't a Lee collet sizing die? If you're using that, the case is sized to another chamber dimension and you could have problems trying to make it fit. I've experienced that too.